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annotate core/src/js/data/StoreAdapter.js @ 30:2dfba21cd879

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author cin
date Wed, 27 Jun 2018 02:46:14 +0300
parents acdcdf1a8d21
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1 define([
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2 "dojo/_base/declare",
1
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3 "../safe",
0
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4 "dojo/when",
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5 "dojo/store/util/QueryResults" ],
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6
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7 function(declare, safe, when, QueryResults) {
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8
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9 "use strict";
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10
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11 /**
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12 * Обертка вокруг произвольного хранилища, только для чтения. Используется
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13 * для преобразования данных, например, отображения в списках элементов
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14 * пространственных данных.
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15 */
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16 return declare(null, {
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17 /**
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18 * @type{String} Свойство, хранящее идентификатор
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19 */
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20 idProperty : null,
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21
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22 _store : null,
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23
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24 /**
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25 * @param{String} opts.idProperty Имя свойства, в которое будет записан
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26 * идентификатор, если не указан, то идентификатор будет
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27 * взят из родительского хранилища или использоваться
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28 * строка <code>id</code>
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29 * @param{dojo.store} opts.store Родительское хранилище
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30 */
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31 constructor : function(opts) {
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32 safe.argumentNotNull(opts, "opts");
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33 safe.argumentNotNull(opts.store, "opts.store");
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34
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35 this._store = opts.store;
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36 delete opts.store;
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37 declare.safeMixin(this, opts);
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38 this.idProperty = opts.idProperty || this._store.idProperty || "id";
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39 },
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40
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41 getParentStore : function() {
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42 return this._store;
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43 },
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44
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45 get : function(id) {
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46 var me = this;
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47 return when(me._store.get(id), function(x) {
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48 var m = me.mapItem(x);
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49 if (!(me.idProperty in m))
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50 m[me.idProperty] = id;
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51 return m;
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52 });
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53 },
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54
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55 /**
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56 * Выполняет запрос в родительском хранилище, для этого используется
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57 * <code>translateQuery</code> для подготовки запроса, затем,
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58 * <code>mapItem</code> для преобразования результатов.
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59 */
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60 query : function(q, options) {
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61 var me = this, store = this._store;
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62 return when(store.query(me.translateQuery(q), me
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63 .translateOptions(options)), function(res) {
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64 var total = res.total;
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65 var mapped = res.map(function(x) {
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66 var m = me.mapItem(x);
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67 if (!(me.idProperty in m))
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68 m[me.idProperty] = store.getIdentity &&
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69 store.getIdentity(x);
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70 return m;
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71 });
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72 mapped.total = total;
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73 var results = new QueryResults(mapped);
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74 console.log(results);
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75 return results;
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76 });
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77 },
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78
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79 getIdentity : function(obj) {
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80 return obj && obj[this.idProperty];
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81 },
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82
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83 /**
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84 * Преобразование запроса в формат родительского хранилища.
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85 *
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86 * @param{Object} q Запрос в формате текущего хранилища
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87 * @returns{Object} Запрос в формате родительского хранилища
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88 */
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89 translateQuery : function(q) {
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90 return q;
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91 },
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92
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93 translateOptions : function(options) {
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94 return options;
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95 },
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96
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97 /**
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98 * Преобразование объекта из родительского хранилища. При преобразовании
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99 * в объекте можно задать идентификатор, иначе идентификатор будет
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100 * автоматически получен и присвоен из родительского хранилища
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101 *
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102 * @param{Object} item Объект из родительского хранилища
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103 * @returns{Object} результат преобразования
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104 */
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105 mapItem : function(item) {
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106 return item;
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107 }
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108 });
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109
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110 });